You can find complete board games that can be customized and printed out or even very simple word scrambles, word finds and word searches. The last three are probably the most commonly found printable games and can usually be found on the web for free.
Unquestionably, these activity sheets are not only mentally stimulating for the young as these encourage critical and creative thinking, but are also quite liberating for the adult companions. With the little geniuses occupied, like during long road trips for example, mom and dad are also afforded some quiet time for themselves. In other words, sometimes a little out_of_the_box thinking is the key for parents to be a step ahead in as far as always having a bag_full of tricks handy.